Power shovel



June 3% 1925',

S. T. HOAR POWER SHOVEL Filed Feb. 17 1923 3 Sheets-Sheet l June 30, 1925.

1,543,771 S. T. HOAR POWER SHOVEL Filed Feb. 1'7, 1923 3 Sheets-Sheet 2 Samuel 2 1% after. 214

June 30, 1925 1,5433% 8. T. HOAR POWER SHOVEL Filed Feb. 1'7, 1923 I5 Sheets-Sheet 3 Patented June 30, 1925.

UNITED STATES PATENT orrics.

SAMUEL TRUAN BOAR, OF MEADEELVILLE, MONTANA, ASSIGNOR OF ONE-HALF T0 JAMES DONER, OF BUTTE, MONTANA. I

POWER SHOVEL.

Application filed February 17, 1923.

To all whom it may concern:

Be it known that I, SAMUEL T. Hoar, a citizen of the United States, residing at Meaderville, county of Silver Bow, and State of Montana, have invented certain new and usefulImprovements in a Power Shovel, of which the following is a specification.

My invention relates to power shovels and particularly to such shovels especially de signed for use in mines.

On account of the narrow passageways and restricted spaces in mines, power shovels of ordinary construction are not adapted for use therein.

The object of my invention is to provide a power shovel of such construction that itmay be readily moved from level to level in mines, pass the chutes and through the various mine galleries; and which shall be sufficiently flexible to work rapidly and freely in the restricted spaces usually occurring in mines, A further object of my invention is to provide a device of the kind mentioned which may be operated to clear the ground from close to the device, to the full reach of the shovel; and which may be operated to readily clear obstructions which resist its power. A further object of my invention is to provide a device as mentioned with means for clamping the same in position during operation. Other objects will appear hereinafter.

With these objects in view, my invention consists generally in a truck mounted upon wheels, a body rotatably mounted thereon, a cross-head slidably mounted on said body, and carrying a pair of drums and means for operating the same, an arm hingedly connected at one end to said crosshead and having a pair of parallel angularly disposed extensions, a scoop lever pivotally mounted between said extensions, and a scoop on said lever, said arm and said lever being connected by cables to said drums respectively. My invtention further consists in a device as mentioned in which tl e v scoop lever is adjustably connected to said -of the mine tracks.

Serial No. 619,613.

the truck and the body are of minimum SlZG, to permit the device to be acc0mmodated in a mine cage for moving it from level to level, and to permit it to pass through the mine galleries, in combination with lateral extensions for the table of the truck to support the body when rotated. My invention further consists in a device as mentioned adapted to run on the mine tracks and further characterized by means for clam ing the device to the rails. My invention further consists in various details of construction and. arrangements of parts all as will be fully described hereinafter and particularly pointed out in the claims.

My invention will be more readily understood by reference to the accompanying drawings forming a part of this specification and in which Fig. 1 is a side elevation of a embodying my invention,

'Fig. 2 is a plan view thereof,

Fig. 3 is a vertical transverse section on the line S-3 of Fig. 1,

Fig. L is a side elevation with parts re moved and scoop raised to enter mine cage and to pass through galleries, and

Fig. 5 is a rear end view of same.

Referring now to the drawings, 1 indicates the table of a truck from which depend side frames 2, provided with boxes or bearings 8 for axles 4; of the wheels 5, said wheels being adapted to run on the rails A The table 1 projects a slight distance laterally beyond the side frames 2, and to these projecting edges are secured extensions 6 which form a continuation of the table to support the superimposed parts when the body is swinging laterally in use as hereinafter described. These extensions are provided with depending plate portions 7 at their inner edges which rest against and may be secured to the side frames 2. Preferably, these plates 7 are provided with bearings 8 to rest on the projecting ends of the axles at, and brackets 9 may be provided for further strengthening the extensions 6. The extensions 6 power shovel are detachably secured to the truck for reasons which will appear hereinafter.

Rotatably mounted on the truck is the body which may be of any preferred construction, but comprises a bottom 11, sides 12 and a rear end plate 13. A king bolt clear-the engines 17 and 28.,

14 passes through the centers of the bottom 11 and truck table 1, and concentric therewith is a large gear 15 fixed .to the truck. Meshing with said gear is a pinion 16 having a vertical shaft extending through the bottom of the body and driven by a reversible rotary enginell; This may be of any desired type and I have therefore illustrated the same but conventionally. 18 indicates a control lever for the engine 17 arranged adj aeent the seat 19 for the operator.

Longitudinally slidable within the body is a crosshead comprising an engine bed plate 20, side walls Qlaudla rear end wall 22. The edges of the plate 20 project beyond the walls 21 and are arranged between guides secured. to the walls 1 2. These guides may consist of angle, irons 31, as shown in .the drawings. Extending longitudinally of the body below the bed plate 20, of the cross head, is a screw shaft, s3, one end of which projects through the rear wall 13 of the body, a: l provided with a sprocket gear Q-l connected by a chain 25 to a gear 26 on a shaft 27 driven by an. engine 28. .The engine 28 isof the reversible type similar to engine 17, and is controlled by a lever 29. which is also within easy reach. from the seat 19. Secured to the engine bedplate is a depending lug 30 through which the screw 23 isthreaded. It is evident that by means of the engine 28 thcengine bed plate may be 'mov d forwardly or baekwardly as desired.

It will be noted that the guides 31 are a' a sulhcient height for the cross-head to fully Tlingedly connected to the forward end of the cross head is an angle frame forsupporting the scoop lever. This frame. comprises an arm 32- hingedly connected at its rear end to the cross-head, as at'33, and a pair of parallel members 84:, 34: secured to the outer end thereof. The arm 32 is at substantially right angles" to the members 34 and preferably secured to the same at about midway oftheir length, forming a T-sh'apedstructure. This may be built up of such structural elements as are found desirable, but in the drawings I have illustrated the are 32 formed of two spaced angle bars 35---85 connected by a plate 36. The rear ends of the bars 35 project beyond the plate 36'and are provided'with eyes to receive a cross rod 37 fixed to the erossrhead. The members 34; may be channel irons secured to the bars 35jby plates 38, and spaced apart by a plate 39, or equivalent elements, above the arm 82. This leaves the space between thelowcr portions of the members 3 1 open and free toperinit free swinging of the scoop v and scoop'lever between them, as willappear hereinafter. l0 indicates the scoop which is rigidly fixed between 'two parallel bars 41--l1, the upper ends of which are connected by a cross bar 4-2; The structure thus formed by the bars 41 and scoop 40 fits between the bars 34 and is pivotally connected thereto as by bolts 413. The bars 34 of the angle frame and the bars 41 formingthe scoop lever are provided with a seriesof holes 441 and 4-5 respectively, for the bolts 48, thereby providing means for adjustment of the scoop with relation to angle frame to adapt the device to various conditions of work. The scoop is, provided with the usual hinged bottom l6 releasably held in position by a latch 47 controlled by a cable 18 ex; tending to a point adjacent the seat 19.

Rotatably mounted in the said cross-head, as between the walls 21, is a pair of cable drums 49 and 50 which are driven by reversible engines 51 and 52 respectively, through sprocket gearing 53 and 54. .55 and 56 indicate the control levers for the engines 51 and '52, said levers being also. arranged adjacentthe seat19. Acable 57: is wound on the drum 49 and is attached to the upper end of the angle frame leveras at 5 and a simliar cable 59 wound on the drum 50'extends over a roller 60 on said angle frame and is connected to, the member 42 of the scoop fran'ie. It is obvious that, as the engines may be independently operated and controlled, that the angle frame and the scoop frame may be independently actuated. l i

The several engines contained. withinithe device may be. of any desired kind and are indicated but conventionally as fluid oper ated,.r.eversible'motors, To this end. a pipe 61 is provided in the body connected to. the engines 17 and 28. This pipe extends through theback of the body and is connected to a flexible supply pipe 62. A pipe63 arranged in the cross-head supplies, the engines 51 and 52, and this is connected by a flexible section 64- to the pipe 61. All the engines are thus supplied from same source; and it will be noted from theiabove descrip tion that the-control levers for all the engines are within reach from the seat 19; hence the operation of the entiredevice under the control of a single operator.

The devise above described is small and comparatively'light;and in order to. hold the same in position and resist the reaction from the force applied to the scoop, means must be provided for holding the device in position during operation. To this end I provide means for clamping the device to the rails. This comprises a pair of shoes 65 hearing against the outer faces of the rails A, and a bolt 66 for clamping the shoes against the rails. The shoes are of any desired form but may be. constructed: of rails, inverted, and: swingingly supported from the side frames a supporting plate 67 being hinged to the side frames as at 68 and having the shoeor rail section 65 attached to its lower edge. Thebolt 66 extends through the apertures in the plates 67, and followers 69 are provided between the shoes and the head and nut of the bolt respectively, as shown, to transmit the force directly to the shoes. To prevent bending the rails A and to form a more secure clamp, a spacing member 70 is suspended from the bolt 66, the

ends of which engage the inner faces of the rails A.

The operation of the device is as follows: To facilitate the transporting of the shovel into the mine, the lateral truck extensions 6 are removed as is also the seat 19 and associated foot rest. The scoop and operating arms are folded back upon the cross-head as shown in Figs. 4 and 5. If desired the bolt 66 and attached parts may also be removed. The device will then occupy a space but the length and breadth of the truck table 1 and will be readily accommodated on the mine cage for lowering to the level where it is to be operated. The wheels 5 fit on the mine tracks and the shovel may be transported thereon through the galleries. lVhen the device has reached the location where it is to operate, the lateral extensions 6 are secured in position, and also the seat 19. If the bolt 66 has been removed, it is inserted in place, together with the spacer 70 and followers 69.

The bolt is then tightened to clamp the device to the rails A.

The engine 28 is then operated to move the cross-head a short distance forwardly and the scoop and actuating frames are lowered into operative position, such as shown in Fig. 1. By manipulating the cables 59 and 57 the scoop may be made to lift a quantity of material into elevated position. The cross-head is then retracted to lessen the radius of swing of the scoop, and the body rotated by engine 17 through approximately 180. The cross-head is again projected, which moves the scoop above a car on the track A behind the device and the scoop is discharged by releasing the latch 47 by cable 18. The cross-head is again retracted and the body swung into operative position, and the operation repeated. Should the scoop encounter a' resistance greater than its ability to overcome, it is evident that it may be cleared by a 1nanipulation of the hinged frames and the crosshead.

I claim:

1. In a device of the class described a truck mounted upon wheels, a body rotatably mounted thereon, a cross-head slidably mounted on said body, an arm hingedly connected at one end to said cross-head and having a pair of parallel angularly disposed extensions, a scoop lever pivotally mounted between said extensions, a scoop on said lever, a pair of drums on said cross-head connected to said arm and said lever respectively, and means for operating said drums independently.

2. A device as set forth in claim 1, further characterized by means for moving said cross-head longitudinally of the body and means for rotating said body, substantially as described.

3. A device as set forth in claim 1 in combination with a screw shaft arranged longitudinally of the body, a lug fixed to said cross-head and in threaded engagement with said screw, and means for operating said screw, substantially as described.

4. A device as set forth in claim 1, in which said body is of substantially the same length and breadth as said truck, in combination with lateral extensions for said truck detaohably mounted thereon, substantially as described.

5. A device as set forth in claim 1 in which said extensions are at substantially right angles to the arm and project both above and below the latter, cables connecting the drums with the arm and lever respectively, and a guide for the scoop lever cable at the upper end of said extensions, substantially as described.

6. A device as set forth in claim 1 further characterized by means for adjustably connecting the scoop lever to said extensions, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

SAMUEL TRUAN HOAR. lVitnesses SARAH A. NANKERVIS, E. G. NANKERVIS. 

